g1201_1300.s1277_count_square_submatrices_with_all_ones

Class Solution

java.lang.Object

g1201_1300.s1277_count_square_submatrices_with_all_ones.Solution

public class Solution
extends Object

1277 - Count Square Submatrices with All Ones.

Medium

Given a m * n matrix of ones and zeros, return how many square submatrices have all ones.

Example 1:

Input: matrix = [ [0,1,1,1], [1,1,1,1], [0,1,1,1] ]

Output: 15

Explanation:

There are 10 squares of side 1.

There are 4 squares of side 2.

There is 1 square of side 3.

Total number of squares = 10 + 4 + 1 = 15.

Example 2:

Input: matrix = [ [1,0,1], [1,1,0], [1,1,0] ]

Output: 7

Explanation:

There are 6 squares of side 1.

There is 1 square of side 2.

Total number of squares = 6 + 1 = 7.

Constraints:

• 1 <= arr.length <= 300
• 1 <= arr[0].length <= 300
• 0 <= arr[i][j] <= 1

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	countSquares(int[][] matrix)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

countSquares

public int countSquares(int[][] matrix)